This programme of research contributed to the understanding of the process of
fitness training adherence of elite netball players. It was designed to quantify fitness
training adherence using a valid method of measurement, identify fitness training
facilitators and barriers, examine the utility of social cognitive theories in predicting
and explaining fitness training adherence and assess the efficacy of a theory-based
intervention aimed at improving training adherence. In Chapter 2.1, the strong
correlations between the diary measures and a 3-week recall measures for aerobic
and strength training frequency (r = .64 and .70, p < .01, respectively) provided
support for the construct validity of the diary method. Adherence was moderate for
both aerobic (71 + 27%, M ± SD) and strength training (65 + 30%). Moreover, only 1
player (4%) managed to fully adhere to the recommended programme. Chapter 2.2
examined the utility of the Theory of Planned Behaviour and Social Cognitive
Theory in predicting aerobic training adherence. Neither of the theories significantly
predicted adherence behaviour. However, within both of the theories, past training
behaviour accounted for a significant unique portion of the variance in training
adherence. In Chapter 2.3 a cross-case analysis of semi-structured interview data
revealed that the key facilitators and barriers of fitness training behaviour could be
usefully viewed within the framework of the revised Theory of Planned Behaviour.
Chapter 2.4 examined the utility of Social Cognitive Theory, the Theory of Planned
Behaviour and the revised Theory of Planned Behaviour in predicting fitness training
adherence. The revised Theory of Planned Behaviour proved to be the best predictor
of training adherence, accounting for 80% (77% adjusted) of the variance. Social
Cognitive Theory and the Theory of Planned Behaviour accounted for 500/0 (41 %
adjusted) and 21 % (11 % adjusted) of the variance in training adherence, respectively.
Chapter 2.5 investigated the efficacy of an intervention, based on the predictions of
the revised Theory of Planned Behaviour, designed to improve training adherence.
Large effect sizes (0.93 - 3.80) for improvements in adherence between baseline and
post-intervention were found for 13 players (760/0). A follow-up assessment over 7-
weeks showed that players' training adherence remained improved.